SIMPLIFIED PRACTICAL TEST METHOD FOR PORTABLE DOSE METERS USING SEVERAL SEALED RADIOACTIVE SOURCES.

Area of Science:

• Medical Physics
• Radiation Detection and Measurement

Background:

• Accurate response of radiation detectors is crucial for dosimetry.
• Testing portable dose meters requires careful consideration of radiation field characteristics.

Purpose of the Study:

• To determine the response, non-linearity, and energy dependence of detector responses using sealed radioactive sources.
• To validate testing methods for portable dose meters under close source-to-detector geometry.

Main Methods:

• Utilized small-activity sealed radioactive sources for detector response determination.
• Employed close source-to-detector geometry (≤ 0.3 m) for practical tests of portable dose meters.
• Applied Monte Carlo simulations to correct for radiation fluence non-uniformity in close geometry setups.

Main Results:

• Detector responses were evaluated for non-linearity and energy dependence.
• Ionizing currents were accumulated to achieve statistically sufficient data for portable dose meter tests.
• Monte Carlo corrected results showed consistency with ISO 4037 reference field measurements within uncertainties.

Conclusions:

• The methodology allows for accurate assessment of portable dose meter performance even with close source-to-detector geometry.
• Monte Carlo simulations are effective in correcting for geometric effects in radiation fields.
• Experimental results validated against international standards (ISO 4037) confirm the reliability of the testing approach.